[126392] in North American Network Operators' Group
Re: BGP and convergence time
daemon@ATHENA.MIT.EDU (shake righa)
Fri May 14 08:46:42 2010
In-Reply-To: <!&!AAAAAAAAAAAuAAAAAAAAAKTyXRN5/+lGvU59a+P7CFMBAN6gY+ZG84BMpVQcAbDh1IQAAAATbSgAABAAAAD1UuvvufFmTLb8ijony/emAQAAAAA=@iname.com>
Date: Fri, 14 May 2010 15:46:17 +0300
From: shake righa <ssrigha@gmail.com>
To: frnkblk@iname.com
Cc: NANOG <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Believe have narrowed down problem to layer 2.
A ping to address 224.0.0.5 shows no reply.
Believe problme to do with blocking of multicast
Regards,
Shake
On Fri, May 14, 2010 at 5:28 AM, Frank Bulk <frnkblk@iname.com> wrote:
> What about IP SLA with some EEM? This link may give you some ideas:
> http://blog.ioshints.info/2008/01/ospf-default-route-based-on-ip-sla.html
>
> Frank
>
> -----Original Message-----
> From: Jay Nakamura [mailto:zeusdadog@gmail.com]
> Sent: Tuesday, May 11, 2010 1:35 PM
> To: NANOG
> Subject: BGP and convergence time
>
> So, we have two upstreams, both coming in on Ethernet. One of our
> switch crashed and rebooted itself. Although we have other paths to
> egress out the network, because the router's Ethernet interface didn't
> go down, our router's BGP didn't realize the neighbor was down until
> default BGP timeout was reached. Our upstream connectivity was out
> for couple minutes.
>
> I am looking for ways to detect neighbor being down faster so traffic
> can be re-routed faster. I can do BFD internally but the issue is how
> the upstream is going to detect the outage and stop routing our
> traffic to that downed link. I have asked both of my upstreams and
> one said they don't do anything like that, second upstream I am still
> waiting on the answer.
>
> My question is, do other carriers do BFD or any other means to detect
> the neighbor being down faster than normal BGP will allow? (Both
> upstreams are major telcos [AT&T and Qwest], so I think they are less
> flexible than some others.)
>
> Or, has anyone succeeded in getting something done with those two carriers?
>
> Thanks!
>
>
>
>
